The World Science Festival is an annual science festival hosted by the World Science Foundation, a 501(c)(3) nonprofit organization based in New York City. There is also an Asia-Pacific event held in Brisbane, Australia.

A science festival is a festival that showcases science and technology with a similar atmosphere to an arts or music festival, and that primarily targets the general public. These public engagement events can be varied, including lectures, exhibitions, workshops, live demonstrations of experiments, guided tours, and panel discussions. There may also be events linking science to the arts or history, such as plays, dramatised readings, and musical productions. The core content is that of science and technology, but the style comes from the world of the arts.